Mechanism with up and down movement?

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SUMMARY

The discussion focuses on mechanisms that facilitate up and down movement, specifically exploring options such as pistons with crankshafts, elevators, car jacks, and forklifts. Key considerations include size, force, and speed, which are critical in determining the appropriate mechanism for a given application. A proposed solution involves using a rod with a cam for horizontal pistons driven by an electric motor, with velocity calculations based on the motor's RPM. The conversation also references a double slider four-bar chain mechanism known as an elliptical trammel, which utilizes bearings for vertical motion.

PREREQUISITES
  • Understanding of linear motion mechanisms
  • Familiarity with piston and crankshaft designs
  • Basic knowledge of electric motor specifications and RPM calculations
  • Concept of four-bar chain mechanisms in mechanical engineering
NEXT STEPS
  • Research the design and application of elevators in mechanical systems
  • Explore the mechanics of car jacks and their operational principles
  • Learn about the design and function of double slider four-bar chains
  • Investigate the use of cam mechanisms in linear motion applications
USEFUL FOR

Mechanical engineers, robotics enthusiasts, and anyone involved in designing or optimizing mechanisms for vertical motion applications.

rvr1974
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Hi ... I was trying to figure out a mechanism which allows for up and down movement. I figured a piston with crankshaft... anyone has any other possibilities?
Thanks
 
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How about an elevator? How about a car jack, or a fork-lift? You need to be more specific in order to answer your question.

Mainly: size, force, speed.
 
I have a simple mchanism that is composed by 2 pistons as the attached figures shows
 

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@firevia, how do you plan to move pistons??

@rvr, there are lot of ways to get linear motion, deciding factor remains the application. You ll have to come up with an application to decide which one to choose.
 
well it is simple , we should install a rod with a cam for the horizental piston and install an electric motor to the (cam-cranck shaft) , velocity can be easily calculated depending on the rpm of the electrical motr , but to make a full design I need configurations.
 
But why do you need the second piston?? You already have a linear reciprocating motion with cam!
And by the way, the linkage you showed is a double slider 4 bar chain, its an elliptical trammel
 
http://www.sciencemuseum.org.uk/images/object_images/535x535/10302774.jpg
 
Last edited by a moderator:
a bearing allows for vertical motion
 

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